I really like that block Feathers. It would be perfect for a quilt I want to make my son-in-law.
If I'm reading your notes right, the center 4-patch is made from 4 (2½") squares and the triangles are cut on the diagonal from rectangles that are 9"x9 3/4", right? Do you start with a partial seam on that first triangle and then finish it when you get around to the other side?
Thanks! :)